Blue wool-dye and process of making same.



UNITED STATES PATENT OFFICE.

ARTHUR WEINBERG, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR TO LEOPOLD CASSELLA a CO., OF FRANKFORT-ON-THE-MAIN, GERMANY.

- BLUE WOOL-DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 718,181, dated January 13, 1903.

Application filed June 27, 1902. Serial No. 113,511. ($peoimens.)

To whom it may concern:

Be it known that I, ARTHUR WEINBERG, a citizen of Prussia, and a resident of Frankfort-on-the-Main, in the Province of Hesse- Nassau, Kingdom of Prussia, Germany, have invented a certain new and usefulBlue Wool- Dye and Process of Making Same, of which the following is a specification.

I have found that by combining p. diazoacetylalkylanilin with the sulfonic acids of the 1.8.dioxynaphthalene and by subsequent saponification of the thus-produced azo bodies new wool-dyestuffs are obtained which are distinguished for their pure-blue shades and great fastness to light.

The process is illustrated by the following example:

Example: 17.8kilos paraamidoacetylethyl- 'anilin are diazotized with thirty-five kilos hydrochloric acid and 6.9 kilos nitrite of soda, and The diazo solution is introduced at centigrade into the solutionlof thirty-two kilos 1. 8.dioxynaphthalene 3. 6. disulfonic acid 7 in presence of a sufficient quantity of acetate of soda. After some hours the temperature is raised to 50 centigrade and the dyestuif salted out. In order to saponify the acetyl group, the dyestuff is dissolved in twelve hundred liters of a caustic-soda lye of five per cent. and the solution is boiled for about one The free lye is then neutralized with hour.

AlkNH- O H,-N=

10 5( s )2( )2 which is a dark bronzy powder easily soluble in water with a reddish-blue color, dissolving in diluted soda lye with a bluish-red color, in

diluted acid with a scarlet color, in concentrated sulfuric acid with a reddish-violet color, and dyeing wool fast blue shades substantially as described.

Signed at Frankfort-on-the-Main, in the Province of HesseNassau, Kingdom of Prussia, Germany, this 31st day of May, A. D. 1902.

ARTHUR WEINBERG.

Witnesses:

JEAN GRUND, CARL GRUND. 

